CN205844165U - A kind of distributed gas concentration detection apparatus - Google Patents
A kind of distributed gas concentration detection apparatus Download PDFInfo
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- CN205844165U CN205844165U CN201620724277.3U CN201620724277U CN205844165U CN 205844165 U CN205844165 U CN 205844165U CN 201620724277 U CN201620724277 U CN 201620724277U CN 205844165 U CN205844165 U CN 205844165U
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- Prior art keywords
- cell
- signal
- gas concentration
- detection apparatus
- concentration detection
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Abstract
The utility model discloses a kind of distributed gas concentration detection apparatus, including light source, multiple PA cell, multiple mike and signal processing module；Light source has multiple output port, is used for exporting modulation light；Multiple PA cell multiple output ports with light source respectively are connected one to one by optical fiber, are used for receiving modulation light, and the tested gas of the modulation light and PA cell that are delivered simultaneously to PA cell produces acoustic pressure fluctuation signal after interacting；Multiple mikes are respectively placed in the cavity wall of PA cell, be used for receiving acoustic pressure fluctuation signal, and acoustic pressure fluctuation signal is converted into the signal of telecommunication；Signal processing module has multiple input ports, is connected with the output port one_to_one corresponding of multiple mikes respectively, for processing the signal of telecommunication of each mike output and showing the signal of telecommunication.This utility model method is simple, and cost is relatively low, is effectively improved the practicality of optoacoustic spectroscopy.
Description
Technical field
This utility model relates to gas concentration detection field, is specifically related to a kind of based on optoacoustic spectroscopy distributed
Gas concentration detection apparatus.
Background technology
Gas concentration is an important parameter in industrial and agricultural production and life, such as to the gas that insulate in electrical equipment
The monitoring of concentration of sulfur hexafluoride is related to the safe operation of power system.Owing to optoacoustic spectroscopy has, selectivity is good, volume
Little, sensitivity is higher, the advantage that can measure in real time, have a good application prospect in field of gas detection.
Existing optoacoustic spectroscopy is mainly surveyed in the way of modulation light beam direct irradiation PA cell is with generation optoacoustic effect
Amount gas concentration, this concentration measuring method is because using the measurement of single-point type, it is impossible to Gas concentration distribution in reflection space
Information, when in detected space, regional area gas concentration is floated, it is impossible in accurate measurement space, gas concentration limits light
The actual application of acousto-optic spectral technology.
Utility model content
For disadvantages described above or the Improvement requirement of prior art, this utility model provides a kind of distributed gas concentration
Detection device, thus solve in prior art when local gas concentration change in space can not accurately in measurement space gas dense
The technical problem of degree.
For achieving the above object, the utility model proposes a kind of distributed gas concentration detection apparatus, including light source,
Multiple PA cell, multiple mike and signal processing module；Described light source has multiple output port, is used for exporting modulation light；
Multiple PA cell multiple output ports with light source respectively are connected one to one by optical fiber, are used for receiving modulation light, pass simultaneously
The tested gas of the modulation light and PA cell that are passed to PA cell produces acoustic pressure fluctuation signal after interacting；Multiple mikes are respectively
It is placed in PA cell cavity wall, is used for receiving described acoustic pressure fluctuation signal, and described acoustic pressure fluctuation signal is converted into the signal of telecommunication；Letter
Number processing module has multiple input ports, is connected with the output port one_to_one corresponding of multiple mikes respectively, is used for processing each
Mike output the signal of telecommunication and show the described signal of telecommunication.
Further, described source includes: laser instrument, photomodulator, optical fiber and beam splitter；Described laser instrument is used for launching
Laser；Described photomodulator is connected with described laser instrument, the side that Laser Modulation is certain dutycycle sent by described laser instrument
Ripple；One end of described optical fiber is connected with photomodulator；One end of described beam splitter is connected with the other end of described optical fiber, described point
The other end of bundle device has multiple output port, for single bundle modulation light is divided into multi beam by modulation light.
Further, PA cell is the hollow cylinder that two ends are through, and in cavity wall, the centre of hollow cylinder is provided with one
The individual cylindrical bore for placing described mike.
Further, the internal diameter of described PA cell is 4mm, a length of 160mm.PA cell internal diameter is the least, light acoustic constant
The biggest, photoacoustic signal is the strongest, but PA cell internal diameter is limited by beam radius, so being set as 4mm.
Further, there is the cylindrical bore laying mike described PA cell position therebetween, described cylindric
A diameter of 4mm in hole, hole depth 5mm, the size in hole depends on the size of mike.Further, the material of described PA cell
For stainless steel.
Further, laser instrument can be semiconductor laser, optical fiber laser or QCL, according to not
Absorption peak place wavelength with gas and the requirement to luminous power select various lasers.Laser instrument is tunable wave length
Semiconductor laser, the centre wavelength of its Output of laser is 1567.32nm.
Further, optical fiber should with laser instrument with the use of, its loss should be less in laser works wave-length coverage.
Further, signal processing module includes signal amplification circuit, data processing module and display circuit, mike
The signal of telecommunication that records is amplified transfers to data processing module to process, and calculates tested gas concentration, and is shown by display circuit
Illustrate.
This utility model uses beam splitter that single bundle modulation light is divided into multi beam modulation light, by optical fiber and multiple PA cell phases
Even, it is achieved that the most multiple points monitor the concentration of gas in real time, breach what existing optoacoustic spectroscopy single-point type was measured
Limit, the regional area tested gas concentration change in detected space, also can realize accurately measuring, and method is simple, becomes
This is relatively low, is effectively improved the practicality of optoacoustic spectroscopy.
Accompanying drawing explanation
Fig. 1 is the structure chart of the distributed gas concentration detection apparatus that this utility model provides.
Fig. 2 is the front view of PA cell in the distributed gas concentration detection apparatus that this utility model provides.
Fig. 3 is the top view of PA cell in the distributed gas concentration detection apparatus that this utility model provides.
Fig. 4 is the left view of PA cell in the distributed gas concentration detection apparatus that this utility model provides.
In all of the figs, identical reference is used for representing identical element or structure, wherein: 1 is laser instrument, 2
For photomodulator, 3 is optical fiber, and 4 is beam splitter, and 5 is PA cell, and 6 is mike, and 7 is signal processing module, and 8 is light source.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain
This utility model, is not used to limit this utility model.Additionally, institute in each embodiment of this utility model disclosed below
Just can be mutually combined as long as the technical characteristic related to does not constitutes conflict each other.
Fig. 1 shows the structure of the distributed gas concentration detection apparatus that this utility model provides, for convenience of description,
Illustrate only the part relevant to this utility model, as follows in conjunction with detailed description:
In this utility model, distributed gas concentration detection apparatus includes: light source 8, multiple PA cell 5, multiple Mike
Wind 6 and signal processing module 7；Light source 8 has multiple output port, is used for exporting modulation light；Multiple PA cell 5 respectively with light source
Multiple output ports of 8 are connected one to one by optical fiber, are used for receiving modulation light, are delivered simultaneously to the modulation light of PA cell 5
Interact with the tested gas of PA cell, in PA cell 5, produce acoustic pressure fluctuation signal；Multiple mikes 6 are respectively placed in light
In cylindrical hole in the operatic tunes 5 cavity wall, it is used for receiving acoustic pressure fluctuation signal, and acoustic pressure fluctuation signal is converted into the signal of telecommunication；Signal
Processing module 7 has multiple input port, is connected with the output port one_to_one corresponding of multiple mikes respectively, is used for processing each wheat
The signal of telecommunication of gram wind output also shows the signal of telecommunication.
In this utility model, light source 8 includes: laser instrument 1, photomodulator 2, optical fiber 3 and beam splitter 4, and laser instrument 1 is used for
Launch laser；Photomodulator 2 is connected with laser instrument 1, the square wave that Laser Modulation is certain dutycycle sent by laser instrument 1；Light
One end of fine 3 is connected with photomodulator 2；One end of beam splitter 4 is connected with the other end of optical fiber 3, and the other end of beam splitter 4 has
Multiple output ports, for being divided into multi beam by modulation light by single bundle modulation light.
In this utility model, laser instrument 1 can be semiconductor laser, optical fiber laser or QCL,
Absorption peak place wavelength according to gas with various and the requirement to luminous power select various lasers.
In this utility model, described optical fiber 3 should with laser instrument with the use of, its loss in laser works wave-length coverage
Should be less.
In this utility model, PA cell 5 is the hollow cylinder that two ends are through, and its internal diameter is 4mm, a length of 160mm, light
The operatic tunes 5 internal diameter is the least, and light acoustic constant is the biggest, and photoacoustic signal is the strongest, but PA cell 5 internal diameter is limited by beam radius, so setting
It is set to 4mm.The material of PA cell 5 can be stainless steel.There is the circle laying mike 6 PA cell 5 position therebetween
Cylinder hole, a diameter of 4mm in hole, hole depth 5mm, the size in hole depends on the size of mike 6.
In this utility model, signal processing module 7 includes signal amplification circuit, data processing module and display circuit,
The signal of telecommunication that mike 6 records is amplified transfers to data processing module to process, and calculates tested gas concentration, and by display
Circuit shows.
Laser instrument 1 is the semiconductor laser of tunable wave length, and the centre wavelength arranging its Output of laser is
1567.32nm, photomodulator 2 is modulated into the periodic modulation laser of frequency 1029Hz, dutycycle 50%.By beam splitter 4
It is divided into the periodic modulation laser that five beam powers are equal, is transmitted to five identical PA cell 5 by optical fiber 3 respectively.
There is optoacoustic effect in 5 interactions in PA cell of the laser of periodic modulation and tested CO gas, produces the cycle
Property acoustic pressure fluctuation signal, and in PA cell 5 resonance amplify, the acoustic pressure fluctuation signal being exaggerated is converted to electricity by mike 6
Signal gives signal processing module 7, shows after signal amplifies conversion, dense owing to can measure the CO gas at difference simultaneously
Degree, solving single-point type gas concentration detection apparatus can not essence after the tested gas concentration of the regional area of detected space changes
The problem really measured, and method is simple, and cost is relatively low, is effectively improved the practicality of optoacoustic spectroscopy.The above is this
One embodiment of utility model, but this utility model is not limited to embodiment and accompanying drawing disclosure of that.Any it is familiar with basis
Those skilled in the art in the technical scope that this utility model discloses, the change that can readily occur in or replacement, all answer
This contains the scope in this utility model protection.Therefore, protection domain of the present utility model should be with scope of the claims
It is as the criterion.
As it will be easily appreciated by one skilled in the art that and the foregoing is only preferred embodiment of the present utility model, not
In order to limit this utility model, all any amendment, equivalents made within spirit of the present utility model and principle and changing
Enter, within should be included in protection domain of the present utility model.
Claims (7)
1. a distributed gas concentration detection apparatus, it is characterised in that include light source (8), multiple PA cell (5), multiple
Mike (6) and signal processing module (7)；
Described light source (8) has multiple output port, is used for exporting modulation light；
Multiple PA cell (5) multiple output ports with light source (8) respectively are connected one to one by optical fiber, are used for receiving modulation
Light, the tested gas of the modulation light and PA cell that are delivered simultaneously to PA cell (5) produces acoustic pressure fluctuation signal after interacting；
Multiple mikes (6) are respectively placed in the cavity wall of PA cell (5), are used for receiving described acoustic pressure fluctuation signal, and by described
Acoustic pressure fluctuation signal is converted into the signal of telecommunication；
Signal processing module (7) has multiple input port, is connected with the output port one_to_one corresponding of multiple mikes respectively, is used for
Process the signal of telecommunication of each mike output and show the described signal of telecommunication.
2. gas concentration detection apparatus as claimed in claim 1, it is characterised in that described light source (8) including: laser instrument (1),
Photomodulator (2), optical fiber (3) and beam splitter (4)；
Described laser instrument (1) is used for launching laser；Described photomodulator (2) is connected with described laser instrument (1), by described laser instrument
(1) Laser Modulation sent is the square wave of certain dutycycle；One end of described optical fiber (3) is connected with photomodulator (2)；Described point
One end of bundle device (4) is connected with the other end of described optical fiber (3), and the other end of described beam splitter (4) has multiple output port,
For single bundle modulation light is divided into multi beam by modulation light.
3. gas concentration detection apparatus as claimed in claim 1 or 2, it is characterised in that described PA cell (5) is that two ends are through
Hollow cylinder, cavity wall is provided with one for the cylindrical bore placing described mike (6).
4. gas concentration detection apparatus as claimed in claim 3, it is characterised in that the internal diameter of described PA cell (5) is 4mm,
A length of 160mm.
5. gas concentration detection apparatus as claimed in claim 3, it is characterised in that a diameter of 4mm of described cylindrical bore, hole
Deep is 5mm.
6. gas concentration detection apparatus as claimed in claim 3, it is characterised in that the material of described PA cell (5) is stainless
Steel matter.
7. gas concentration detection apparatus as claimed in claim 2, it is characterised in that described laser instrument (1) is tunable wave length
Semiconductor laser, the centre wavelength of its Output of laser is 1567.32nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620724277.3U CN205844165U (en) | 2016-07-11 | 2016-07-11 | A kind of distributed gas concentration detection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620724277.3U CN205844165U (en) | 2016-07-11 | 2016-07-11 | A kind of distributed gas concentration detection apparatus |
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| CN201620724277.3U Expired - Fee Related CN205844165U (en) | 2016-07-11 | 2016-07-11 | A kind of distributed gas concentration detection apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122445A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonance type T-shaped enhanced simultaneous detection method for multiple trace gases |
| CN111122444A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonant T-shaped enhanced multiple trace gas simultaneous detection device |
-
2016
- 2016-07-11 CN CN201620724277.3U patent/CN205844165U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122445A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonance type T-shaped enhanced simultaneous detection method for multiple trace gases |
| CN111122444A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonant T-shaped enhanced multiple trace gas simultaneous detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20200711 |
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| CF01 | Termination of patent right due to non-payment of annual fee |